15 Carat Cushion Lab Grown Diamond Prices Comparison
A 15 carat cushion lab grown diamond typically costs $13,521 (median of 116 listings at 6 online stores), with most between $5,278 and $35,291. Average prices rose 1.6% over the last month. Updated .
Average $14,892. Listings run from $2,878 to $492,658 in the 15.00–15.99 carat range.
See the live listings15 Carat Cushion Lab Grown Diamond Market Overview
CaratRadar currently tracks 116 verified 15-carat cushion lab grown diamonds in the 15.00–15.99 carat benchmark range, listed across 6 online retailers. Prices in this segment range from $2,878 to $492,658, with an average asking price of $14,892 and a median of $13,521.
Across this category, asking prices span $489,780 (99.4% from the most expensive to the cheapest listing). The same certified diamond can also be listed at different prices by different retailers, which is why CaratRadar compares stones by certificate number.
These figures use the same benchmark range throughout the page and are based on our latest daily market data, matched by certification lab and certificate number across retailers, so you are comparing the exact same diamond.
116 diamonds tracked in the 15.00–15.99 carat benchmark
Price range: $2,878 to $492,658
Average price: $14,892
Median price: $13,521
Available across 6 retailers
Category price spread: 99.4%
Price Range Overview
As of Oct 23, 2026Real market range for this carat, shape, and diamond type.
116
$2,878
$14,892
$13,521
$492,658
Price History
Price Comparison Matrix
Compare nearby
Prices for the next carat weights, other shapes and the natural twin.
Nearby carat weights
Other shapes at 15 carat
- 15 carat round lab grown diamond pricesAverage $20,375
- 15 carat oval lab grown diamond pricesAverage $13,228
- 15 carat emerald lab grown diamond pricesAverage $11,236
- 15 carat pear lab grown diamond pricesAverage $12,542
- 15 carat radiant lab grown diamond pricesAverage $12,072
- 15 carat heart lab grown diamond pricesAverage $17,236
Live Listings
See all listingsCompare current retailer offers in the same benchmark range and open any listing for full details.
Save 74.1%IGI | 15ct | Cushion | F | VVS2 | Fair
From $3,949
Compare at $15,267
Save 70.9%IGI | 15.06ct | Cushion | F | VS2 | Ideal
From $3,995
Compare at $13,720
Save 67.9%IGI | 15.04ct | Cushion | G | VS1 | Ideal
From $4,172
Compare at $12,988
Save 67.8%IGI | 15.03ct | Cushion | G | VS1 | Ideal
From $4,200
Compare at $13,047
Save 68.1%IGI | 15.16ct | Cushion | G | VS1 | Ideal
From $4,236
Compare at $13,265
Save 73.9%IGI | 15.08ct | Cushion | G | VVS2 | Very Good
From $4,267
Compare at $16,332
Save 68%IGI | 15.05ct | Cushion | F | VS2 | Excellent
From $4,364
Compare at $13,644
Save 73.5%IGI | 15.08ct | Cushion | H | VVS2 | Very Good
From $4,428
Compare at $16,724
Save 67.1%IGI | 15.18ct | Cushion | F | VS2 | Ideal
From $4,574
Compare at $13,906
Save 73.9%IGI | 15.04ct | Cushion | F | VS1 | Excellent
From $4,599
Compare at $17,591
Save 73.9%IGI | 15.06ct | Cushion | F | VS1 | Ideal
From $4,605
Compare at $17,615
Save 73.9%IGI | 15.09ct | Cushion | F | VS1 | Ideal
From $4,614
Compare at $17,650
Save 73.9%IGI | 15.1ct | Cushion | F | VS1 | Very Good
From $4,617
Compare at $17,662
Save 73.8%IGI | 15.08ct | Cushion | F | VS1 | Ideal
From $4,620
Compare at $17,638
Save 71.9%IGI | 15.15ct | Cushion | F | VS2 | Ideal
From $4,664
Compare at $16,580
Save 74.4%IGI | 15.55ct | Cushion | F | VS1 | Excellent
From $4,665
Compare at $18,188
Save 67%IGI | 15.03ct | Cushion | G | VVS2 | Good
From $4,778
Compare at $14,500
Save 68.8%IGI | 15.05ct | Cushion | G | VVS2 | Very Good
From $4,797
Compare at $15,363
Save 74.5%IGI | 15.03ct | Cushion | F | VVS2 | Very Good
From $4,885
Compare at $19,142
Save 78.2%IGI | 15.01ct | Cushion | G | VS2 | Ideal
From $4,901
Compare at $22,450
Save 74.5%IGI | 15.08ct | Cushion | F | VVS2 | Ideal
From $4,901
Compare at $19,206
Save 74.5%IGI | 15.09ct | Cushion | F | VVS2 | Ideal
From $4,904
Compare at $19,219
Save 75%IGI | 15.03ct | Cushion | F | VVS2 | Ideal
From $4,908
Compare at $19,600
Save 75%IGI | 15.03ct | Cushion | F | VVS2 | Ideal
From $4,908
Compare at $19,600
Save 75%IGI | 15.06ct | Cushion | F | VVS2 | Excellent
From $4,918
Compare at $19,640
Save 75%IGI | 15.06ct | Cushion | F | VVS2 | Very Good
From $4,918
Compare at $19,640
Save 64.4%IGI | 15.09ct | Cushion | F | VS2 | Very Good
From $4,920
Compare at $13,821
Save 75%IGI | 15.07ct | Cushion | F | VVS2 | Very Good
From $4,921
Compare at $19,650
Save 64.1%IGI | 15.02ct | Cushion | F | VS2 | Very Good
From $4,925
Compare at $13,703
Save 75%IGI | 15.68ct | Cushion | F | VVS2 | Very Good
From $4,928
Compare at $19,698
Save 72%IGI | 15.1ct | Cushion | H | VS2 | Very Good
From $4,931
Compare at $17,620
Save 73.8%IGI | 15.01ct | Cushion | F | VVS2 | Excellent
From $4,932
Compare at $18,817
Save 74.5%IGI | 15.09ct | Cushion | F | VVS2 | Ideal
From $4,936
Compare at $19,349
Save 68.1%IGI | 15.06ct | Cushion | F | VVS2 | Very Good
From $4,940
Compare at $15,493
Save 65.1%IGI | 15.28ct | Cushion | F | VS2 | Ideal
From $4,942
Compare at $14,151
Save 75%IGI | 15.73ct | Cushion | F | VVS2 | Very Good
From $4,944
Compare at $19,761
Save 74.5%IGI | 15.51ct | Cushion | F | VVS2 | Ideal
From $4,976
Compare at $19,485
Save 68%IGI | 15.17ct | Cushion | F | VVS2 | Very Good
From $5,038
Compare at $15,727
Save 78.2%IGI | 15.44ct | Cushion | G | VS2 | Ideal
From $5,042
Compare at $23,090
Save 73.6%IGI | 15.04ct | Cushion | F | VVS2 | Very Good
From $5,056
Compare at $19,155
Save 75.5%IGI | 15.02ct | Cushion | F | VVS2 | Very Good
From $5,058
Compare at $20,630
Save 75.5%IGI | 15.03ct | Cushion | F | VVS2 | Very Good
From $5,061
Compare at $20,640
Save 76.1%IGI | 15.61ct | Cushion | F | VVS2 | Ideal
From $5,065
Compare at $21,170
Save 72%IGI | 15.63ct | Cushion | H | VS2 | Ideal
From $5,104
Compare at $18,230
Save 73.5%IGI | 15.06ct | Cushion | F | VVS2 | Excellent
From $5,215
Compare at $19,702
Save 66.5%IGI | 15.09ct | Cushion | F | VVS2 | Ideal
From $5,225
Compare at $15,591
Save 63.5%IGI | 15.02ct | Cushion | F | VS1 | Very Good
From $5,258
Compare at $14,414
Save 63.1%IGI | 15.04ct | Cushion | F | VS1 | Very Good
From $5,342
Compare at $14,467
IGI | 15.05ct | Cushion | F | VS1 | Ideal
From $5,388
Compare at $17,207
Save 64.5%IGI | 15.05ct | Cushion | F | VVS2 | Very Good
From $5,496
Compare at $15,481
Entry pricing in this benchmark range starts around $2,878.
What to Know When Shopping for 15 Carat Cushion Lab Grown Diamonds
- Always compare identical certified diamonds across retailers, because the same certificate can be listed at different prices by different stores. Across this whole category, asking prices span $489,780 from the cheapest to the most expensive listing.
- Focus on the 4Cs that matter most to you. Color and clarity grades drive price more than cut in many segments, but cut affects sparkle the most.
- The median price of $13,521 is a useful benchmark. If you see a deal significantly below this, verify the retailer's reputation and return policy.
- Consider eye-clean alternatives. Moving one clarity grade down (e.g., VS2 to SI1) can save 10-15% with no visible difference to the naked eye.
- Lab-grown diamonds offer excellent value. Ensure the stone comes with a GIA or IGI certificate confirming it is laboratory-grown.
- Check shipping, insurance, and return policies. The lowest sticker price is not always the best deal once you factor in total cost of purchase.
- Cushion cuts come in standard and modified brilliant varieties. Modified brilliants tend to show more fire, while standard cushions have broader facets.
Frequently Asked Questions
We currently track 116 comparable stones in the 15.00–15.99 carat benchmark range. Prices start around $2,878 and go up to $492,658.
Based on the latest market data, the average asking price is about $14,892 with a median around $13,521.
The observed spread is roughly $489,780 across tracked listings, which is about 99.4% from highest to lowest offer in the 15.00–15.99 carat benchmark range.
We refresh pricing data daily so these pages stay current with market changes.
Based on completed market data, the fair market benchmark is $14,892. The median price is $13,521, so offers between the median and fair benchmark can be reasonable, while reputable listings below the median may be especially competitive.
We currently track this stone category across 6 online retailers, giving you a broad view of the competitive landscape.
For most buyers, color differences below G are hard to detect once set in a ring. Clarity grades of VS2 and above are typically eye-clean. Prioritize cut quality for maximum brilliance, then balance color and clarity based on your budget.
Retailer pricing strategies, overhead costs, and margin targets all contribute. Across this category, asking prices span $489,780 from the cheapest to the most expensive listing, and the same certified diamond can also carry different prices at different sellers, which is why direct certified-diamond comparison is essential.
We match diamonds across retailers by their certification lab and certificate number. This means the prices you see are for the exact same physical diamond, not just stones with similar specs. It is a true apples-to-apples comparison.
Diamond prices fluctuate based on supply and demand. Our data refreshes regularly so you can track trends over time. Use the price range on this page as a benchmark and compare it to historical averages when available.
Diamond Terminology
- Carat
- A unit of weight for diamonds equal to 200 milligrams. Larger carat weights are exponentially rarer, which is why prices increase non-linearly with size.
- Cut
- Refers to how well a diamond's facets interact with light. Cut quality ranges from Ideal to Poor and is the single biggest factor affecting a diamond's brilliance.
- Color
- Grades a diamond's lack of color on a scale from D (colorless) to Z (light yellow). Grades D-F are considered colorless; G-J are near-colorless and offer good value.
- Clarity
- Measures the presence of internal inclusions or surface blemishes. Grades range from Flawless (FL) to Included (I3). Most inclusions in VS2 and above are invisible to the naked eye.
Tools and Guides
Tracking Lab Grown inventory for the 15.00–15.99 carat Cushion diamond benchmark.